body main {
  width: 100%;
  background-color: #F4F4F4;
}
body main ul li span {
  display: block;
  width: 100%;
  font-size: 2.3rem;
  line-height: 5.5rem;
  letter-spacing: 0.1rem;
  border-bottom: 1px solid #a5a5a5;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
}
body main ul li div {
  height: 0;
  overflow: hidden;
}
body main ul li div a {
  display: block;
  float: left;
  width: 100%;
  height: 10rem;
  line-height: 40px;
  padding: 1rem 1.8rem;
  border-bottom: 1px solid #ccc;
  background-color: #fff;
}
body main ul li div a em {
  display: inline-block;
  width: 4rem;
  height: 4rem;
  line-height: 4rem;
  background-color: #ccc;
  color: #fff;
  margin-right: 1rem;
  font-size: 2.5rem;
  text-align: center;
}
body main ul li div a:nth-of-type(1) em {
  background-color: red;
}
body main ul li div a:nth-of-type(2) em {
  background-color: orange;
}
body main ul li div a:nth-of-type(3) em {
  background-color: yellowgreen;
}
body main ul li div a i {
  font-size: 3rem;
  line-height: 1;
}
body main ul li div a p {
  font-size: 1.8rem;
  color: #666;
  height: 3rem;
  line-height: 3rem;
}
nav {
  height: 6rem;
  line-height: 6rem;
  padding-left: 1.2rem;
  margin-bottom: 1.33333333rem;
  margin-top: 1.33333333rem;
  font-size: 1.9rem;
  background-color: #f4f4f4;
  border-top: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
}
